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JOHN G. GUERRANT AND BENTON FIELD, OF LEAKSVILLE, NORTH CAROLINA.

Letters Patent No. 70,553, dathcl November 5, 1867; i

IMPROVEMENT In suesavme MACHINES.

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vTO ALL WHOM IT MAY CONCERN:

Be it known that we, JOHN G. GUERRANT and BENTON J. FIELD, of Leaksville, in the countyof Rockingham, and State of North Carolina, have invented a new and useful Improvement in Engraving Machines; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, which are made part of this specification, and in which Figure 1 is a top view or plan.

Figure 2 is a side elevation.

Figure 3 is a horizontal section on the line x x, fig. 2

Figure 4 is a perspective view.

This is an improvement upon our engraving machine secured to us by Letters Patent hearing date December 12, 1866, and numbered 60,506. v i

To secure proper presentation of the plate to the gravel", the former is placed upon a holder, A, which is adjustable in a horizontal plane upon a centre, whose axis is coincident with the axis of rotation of the post B, on which the graver-stafi C is supported. The graver is socketed in the end of a'rpd, E, which is adjustable longitudinally towards and from the plate which is being engraved. The graver-rod, near its operative end, has a bearing in apivoted graver-arm, D, with a counterbalance, F, to give the graver a tendency towards the plate-holder A. The graver-arm D is attached by an extensible connection, G G',to the tracing-arm H, in such a manner that the forward motion of the tracing-arm actuates the graver-arm in the same direction. A board, I, is provided, on which a diagram of the object to be engraved is placed. The tracing-point It being conducted over the marks or outlines of the object on the tracing-board causes motion corresponding, except in extent, of the graver upon the plate, which is supported upon the holder A.- The graver-rod E, the graver-arm D, and tracing-arm H, together with the extensible rod G G, which connects the latter two, have their bearings and support on the staif-G, which has motions in vertical and horizontal planes, and their combinations. The

adjustment in vertical and horizontal planes of the stafl' 0 permits the tracing-point k to follow the lines on the board I, whatever may be their direction, and the relative sizes of the diagram on the tracing-board and the engraved design will be proportionate to the relative distances of the tracing-point and the graver-point from the centre of oscillation (B) of the staff. The tracing-arm H is adjustable towards and from the centre of oscillation of the stafi', so as to make a-larger or smaller engraving from adiagram of a; given size on the tracing-board I. The latter is also adjustable on the base-plate, to accommodate its position to that of the tracer. The presentation of the graver-point D in the right direction is attained by the rotation of the rod B in which the graver is socketed, the disk J, on the rear end of said rod, affording the means of. manipulation. As the graver D traverses over the plate in a horizontal plane, the plate is adjusted upon the same axis of rotation, so that the proximity of the tool and the plate is maintaincrhbut a definite provision is made for advancing and retreating the graver-point to and from the plate as the graver movcs vertically-f As the stud C moves in a vertical plane, the rod G G, connecting the tracing-arm to the graver arm, is lengthened or shortened by a guide-plate, K, whose slots are traversed by studs 9 g, upon the respective por tions of the rod G G, which slide upon each-other. For making vertical lines, an adjustable vertical guide-rod,

L, against which the staff C traverses,.is provided in the rear of said guide-rod, being held in the adjustable rest M. To give a greater or less depth of cut to the graver, the pivoted point of adjustment 9*, of the rear end of the extensible rod G G, is brought nearer to or more distant from the axis of the tracing-arm H, so as to vary the extent of motion imparted to the extensible rod, and consequently the forward motion of the graver D towards the plate. In engraving within an interior surface, such as within a ring, the graver is so placed at the end of a holder as to project downward into the article to be engraved, which is held in a hollow socket or its equivalent. The staff C is pivoted on a horizontalaxis, N, which intersects the axis of rotation of the post B. This gives it two motions, vertical andhorizontal, and any combination of these may be made to produce oblique lines or curves of any character. These motions of thestafi', C may be made by hand, or theyv may be accomplished by journalling the stud at its outer end in a slide rest which is capable of imparting horizon tal and vertical motions by screws. A rose-cutter may be substituted for the graver D, and the cutter-shaft revolved by a band and pulley with motion derived from an exterior motor, or from a treadle worked by the operator.

Having described our invention, what we claim as new, and desire to secure by Letters Patent, is-- 1. The holder A, adjustable in a horizontal plane upon a centre coincident with the axis of rotation of the post which carries the graver-shaft, substantsally as described.

2. The arrangement of the extensible rod G G, connecting the tracing-arm H with the graver-arm D, substantially as described. I

3. The adjustment of the connecting-rotPGr G, at the point of attachment to the tracing-arm, so as to vary the degree of penetration of the graver, substantially as described.

4. The rotating graver D, in combination with the vibrating and counterpoised graver-arm D.

5. The vibrating slotted guide-plate K, constructed and operating substantially as described and represented.

6. The guide-rod L, planted in the adjustable slide-rest M, and affording a guide for operating the cutter on a given vertical line. To the above specification of our invention we have signed our hands this 15th day of March, 1867.

JNO. C. GUERRANT, B. J. FIELD;

Witnesses:

Fmners M. HAMLIN, WM. S. RANKIN. 

